Band-gap reference voltage source circuit

Abstract

The invention discloses a band-gap reference voltage source circuit which comprises a pre-regulation voltage circuit used for generating pre-regulation voltage; the pseudo cascode current mirror circuit is connected with the pre-regulation voltage circuit and is used for carrying out current mirror processing according to the pre-regulation voltage to generate a first voltage signal and a second voltage signal which are equal in voltage value; the negative feedback operational amplifier loop is connected with the pre-regulation voltage circuit and the pseudo cascode current mirror circuit, and is used for carrying out negative feedback regulation processing on the first voltage signal and the second voltage signal according to the pre-regulation voltage so as to ensure that the voltage values of the first voltage signal and the second voltage signal are kept equal, and outputting corresponding band-gap reference voltage; the booster circuit is connected with the negative feedback operational amplifier loop and is used for boosting the band-gap reference voltage; and the pre-regulation voltage circuit is connected with the booster circuit and is also used for updating the pre-regulation voltage according to the boosted band-gap reference voltage. According to the invention, the chip area and power consumption are effectively saved, and the PSRR performance of the band-gap reference voltage is improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a bandgap reference voltage source circuit. Background technique [0002] The reference voltage is one of the basic analog unit circuits in integrated circuit design. The reference voltage can provide voltages that do not vary with temperature and power supply voltage for other modules of the system, such as analog-to-digital converters (Analog-to-Digital Converter, referred to as ADC), (Digital-to-Analog Converter, referred to as DAC), power management and voltage Controlled oscillator (Voltage-Controlled Oscillator, referred to as VCO) and other module circuits. Therefore, the reference voltage is an important content in current integrated circuit design. [0003] The base-emitter voltage V of a bipolar junction transistor (BJT) BE exhibits a negative temperature coefficient characteristic. At unequal collector currents, the difference ΔV in th...

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Problems solved by technology

[0004] However, the above-mentioned method of additionally designing the startup circuit and adding a linear voltage regulator, the PSRR performance of the bandgap reference voltage source circuit is limited, and the area and power consumption of the chip are increased.

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